C#图片水印类

这个是学习用的呃，主要看一下水印在修改图片中距左边的宽度和高度是杂弄的就哦客了。

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.IO;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace ECHX.BLL
{
    /// <summary>
    /// WaterMark 的摘要说明
    /// </summary>
    ///
    /// <param name="strCopyright">要加入的文字</param>
    /// <param name="strMarkPath">水印图片路径</param>
    /// <param name="strPhotoPath">要加水印的图片路径</param>
    /// <param name="strSavePath">处理后的图片路径</param>
    /// <param name="iMarkRightSpace">水印在修改图片中距左边的宽度</param>
    /// <param name="iMarkButtomSpace">水印在修改图片中距底部的高度</param>
    /// <param name="iDiaphaneity">水印图片的透明度</param>
    /// <param name="iFontRightSpace">文字</param>
    /// <param name="iFontButtomSpace">文字</param>
    /// <param name="iFontDiaphaneity">文字</param>
    /// <param name="bShowCopyright">是否显示文字</param>
    /// <param name="bShowMarkImage">是否显示水印图片</param>

    public class WaterMark
    {
        #region param
        private string strCopyright, strMarkPath, strPhotoPath, strSavePath;
        private int iMarkRightSpace, iMarkButtomSpace, iDiaphaneity;
        private int iFontRightSpace = 0, iFontButtomSpace = 0, iFontDiaphaneity = 80;
        private int iFontSize = 10;
        private bool bShowCopyright = true, bShowMarkImage = true;
        #endregion

        #region WaterMark
        public WaterMark()
        {
            this.strCopyright = "";
            this.strMarkPath = null;
            this.strPhotoPath = null;
            this.strSavePath = null;
            this.iDiaphaneity = 70;
            this.iMarkRightSpace = 0;
            this.iMarkButtomSpace = 0;
        }

        /// <summary>
        /// 主要用两样都加的
        /// </summary>
        /// <param name="copyright">要加入的文字</param>
        /// <param name="markPath">水印图片路径</param>
        /// <param name="photoPath">要加水印的图片路径</param>
        /// <param name="savePath">处理后的图片路径</param>
        public WaterMark(string copyright, string markPath, string photoPath, string savePath)
        {
            this.strCopyright = copyright;
            this.strMarkPath = markPath;
            this.strPhotoPath = photoPath;
            this.strSavePath = savePath;
            this.iDiaphaneity = 70;
            this.iMarkRightSpace = 0;
            this.iMarkButtomSpace = 0;
        }
        #endregion

        #region property

        /// <summary>
        /// 设置是否显示水印文字
        /// </summary>
        public bool ShowCopyright
        {
            set { this.bShowCopyright = value; }
        }

        /// <summary>
        /// 设置是否显示水印图片
        /// </summary>
        public bool ShowMarkImage
        {
            set { this.bShowMarkImage = value; }
        }
        /// <summary>
        /// 获取或设置要加入的文字
        /// </summary>
        public string Copyright
        {
            set { this.strCopyright = value; }
        }

        /// <summary>
        /// 获取或设置加水印后的图片路径
        /// </summary>
        public string SavePath
        {
            get { return this.strSavePath; }
            set { this.strSavePath = value; }
        }

        /// <summary>
        /// 获取或设置水印图片路径
        /// </summary>
        public string MarkPath
        {
            get { return this.strMarkPath; }
            set { this.strMarkPath = value; }
        }

        /// <summary>
        /// 获取或设置要加水印图片的路径
        /// </summary>
        public string PhotoPath
        {
            get { return this.strPhotoPath; }
            set { this.strPhotoPath = value; }
        }

        /// <summary>
        /// 设置水印图片的透明度
        /// </summary>
        public int Diaphaneity
        {
            set
            {
                if (value > 0 && value <= 100)
                    this.iDiaphaneity = value;
            }
        }

        /// <summary>
        /// 设置水印字体的透明度0-255
        /// </summary>
        public int FontDiaphaneity
        {
            set
            {
                if (value >= 0 && value <= 255)
                    this.iFontDiaphaneity = value;
            }
        }

        /// <summary>
        /// 设置水印图片在修改图片中距左边的高度
        /// </summary>
        public int MarkRightSpace
        {
            set { this.iMarkRightSpace = value; }
        }

        /// <summary>
        /// 设置水印图片在修改图片中距底部的高度
        /// </summary>
        public int MarkButtomSpace
        {
            set { this.iMarkButtomSpace = value; }
        }

        /// <summary>
        /// 设置水印字体在修改图片中距左边的距离
        /// </summary>
        public int FontRightSpace
        {
            set { iFontRightSpace = value; }
        }

        /// <summary>
        /// 设置水印字体在修改图片中距底部的高度
        /// </summary>
        public int FontButtomSpace
        {
            set { iFontButtomSpace = value; }
        }

        #endregion

        /// <summary>
        /// 生成水印图片
        /// </summary>
        /// <returns></returns>
        public void createMarkPhoto()
        {
            Bitmap bmWatermark = null;
            Image gPhoto = Image.FromFile(this.strPhotoPath);
            int PhotoWidth = gPhoto.Width;
            int PhotoHeight = gPhoto.Height;
            Bitmap bitPhoto = new Bitmap(PhotoWidth, PhotoHeight, PixelFormat.Format24bppRgb);
            bitPhoto.SetResolution(gPhoto.HorizontalResolution, gPhoto.VerticalResolution);

            try
            {
                if (bShowCopyright)
                {
                    Graphics grPhoto = Graphics.FromImage(bitPhoto);
                    grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
                    grPhoto.DrawImage(gPhoto, new Rectangle(0, 0, PhotoWidth, PhotoHeight), 0, 0, PhotoWidth, PhotoHeight, GraphicsUnit.Pixel);

                    Font crFont = new Font("楷体", iFontSize, FontStyle.Bold);
                    SizeF crSize = grPhoto.MeasureString(strCopyright, crFont);

                    //设置字体在图片中的位置
                    float yPosFromBottom = PhotoHeight - iFontButtomSpace - (crSize.Height);

                    //float xCenterOfImg = (phWidth/2);
                    float xCenterOfImg = PhotoWidth - iFontRightSpace - (crSize.Width / 2);
                    //设置字体居中

                    StringFormat StrFormat = new StringFormat();
                    StrFormat.Alignment = StringAlignment.Center;

                    //设置绘制文本的颜色和纹理 (Alpha=153)
                    SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(this.iFontDiaphaneity, 0, 0, 0));

                    //将版权信息绘制到图象上
                    grPhoto.DrawString(strCopyright, crFont, semiTransBrush2, new PointF(xCenterOfImg, yPosFromBottom), StrFormat);

                    gPhoto = bitPhoto;
                    grPhoto.Dispose();
                }

                if (bShowMarkImage)
                {
                    //创建一个需要填充水银的Image对象
                    Image imgWatermark = new Bitmap(strMarkPath);
                    int iMarkWidth = imgWatermark.Width;
                    int iMarkmHeight = imgWatermark.Height;

                    Graphics grWatermark = null;
                    if (bShowCopyright)
                    {
                        //在原来修改过的bmPhoto上创建一个水银位图
                        bmWatermark = new Bitmap(bitPhoto);
                        bmWatermark.SetResolution(gPhoto.HorizontalResolution, gPhoto.VerticalResolution);
                    }
                    else
                    {
                        bmWatermark = new Bitmap(gPhoto);
                    }

                    //将位图bmWatermark加载到Graphics对象
                    grWatermark = Graphics.FromImage(bmWatermark);
                    ImageAttributes imageAttributes = new ImageAttributes();

                    ColorMap colorMap = new ColorMap();

                    colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                    colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

                    ColorMap[] remapTable = { colorMap };

                    imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

                    float[][] colorMatrixElements = {
                          new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
                          new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
                          new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
                          new float[] {0.0f, 0.0f, 0.0f, (float)iDiaphaneity/100f, 0.0f},
                          new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};
                    ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

                    imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

                    grWatermark.DrawImage(imgWatermark, new Rectangle((PhotoWidth - iMarkRightSpace - (iMarkWidth / 2)), (PhotoHeight - iMarkButtomSpace - (iMarkmHeight / 2)), iMarkWidth, iMarkmHeight), 0, 0, iMarkWidth, iMarkmHeight, GraphicsUnit.Pixel, imageAttributes);

                    gPhoto = bmWatermark;
                    grWatermark.Dispose();
                    imgWatermark.Dispose();
                }
                gPhoto.Save(strSavePath, ImageFormat.Jpeg);
            }
            finally
            {

                if (bitPhoto != null)
                    bitPhoto.Dispose();

                if (bmWatermark != null)
                    bmWatermark.Dispose();

                gPhoto.Dispose();
            }

        }
    }
}